Easter Island monument mystery solved?

Researchers have long wondered why ancient people built the famous Easter Island monuments where they did.

Today in science: Finding magnetic south

On January 16, 1909, a team of Antarctic explorers thought they’d found the magnetic south pole. Then, a few years later, they began to have doubts.

Illustration of an astronaut floating in a dark sky with a dark blue whirlpool in the background.

Rotating black holes as portals for hyperspace travel

One of the most cherished science fiction scenarios is using a black hole as a portal to another dimension or time or universe. Is it possible? Maybe. But choose carefully. All black holes are not created equal.

The shrinking Aral Sea

The Aral Sea was once the world’s 4th-largest lake. But in the 1960s, the Soviet Union diverted 2 major rivers to irrigate farmland, and the Aral Sea has been slowly disappearing ever since.

Horseback rider crosses a yellow plain, in front of a snow-covered mountain .

Black carbon from Gulf War shows up in Tibet glacier

A study traces black carbon from 1991 Kuwait oil fires to ice in northern Tibet. Researchers say this soot could affect glacier melt at the Tibetan plateau, considered the “Water Tower of Asia.”

What’s a Blood Moon?

The upcoming total lunar eclipse on the night of January 20-21 is being called a Blood Moon eclipse. Why? Here’s the reason.

What is the zodiac?

Maybe you associate the word ‘zodiac’ with astrology, but it has an honored place in astronomy, too. It’s defined by the annual path of the sun across our sky.

When does the Age of Aquarius begin?

Astronomers and astrologers may agree that the Age of Aquarius starts when the vernal equinox point moves out of constellation Pisces and into Aquarius. But when will that be? There’s no definitive answer.

Sun’s entry into zodiac signs, 2019

Astrology and astronomy are different systems. In some systems of astrology, signs of the zodiac remain fixed relative to seasonal markers, such as the equinox and solstice points on the sky’s dome.

How many supermoons in 2019?

We’ll have a series of 3 full supermoons on January 21, February 19 and March 21, 2019. Of these, the February 19 full moon will be the closest and largest full supermoon of 2019.

New Year's Eve fireworks in Singapore 2019.

Why the New Year begins on January 1

Celebrating the New Year on January 1 is a civil event, not an astronomical one. And yet nature cooperates to make January 1 a satisfying time to start anew.

EarthSky’s most popular photos of 2018

Wow! Huge thanks to the EarthSky community for all the images you’ve contributed this year. Here are some of 2018’s most popular photos.

Is time travel possible?

Sure it is, says this physicist, but only if you have an object with infinite mass. Here’s the story of how to build a time machine, with a design that’s deceptively simple.

50th anniversary of 1st Earthrise photo from moon

A video visualization of events leading to one of the best-known photographs of the 20th century – Earth rising over the moon – as seen by Apollo 8 astronauts 50 years ago.

What are your chances for a white Christmas?

For people in the continental United States, here’s your historic probability of getting a white Christmas in 2018.

Was the Christmas Star real?

Are there any possible astronomical explanations for the Star of Bethlehem or Christmas star?

What would a warmer world look like?

According to the recent IPCC Special Report, warming of 1.5°C (2.7°F) is an important threshold for many climate impacts. What might our planet look like with 1.5°C of warming?

Christmas Bird Count starts December 14

Audubon’s annual Christmas Bird Count is one of the longest-running citizen science projects in existence. How to participate.

Prehistoric cave art suggests ancient use of complex astronomy

As far back as 40,000 years ago, cave-dwellers in what’s now Turkey, Spain, France and Germany all used a method of date-keeping based on the stars. Some of their cave paintings aren’t just depictions of wild animals; instead they represent constellations in the night sky.

Listening to the patterns of the universe

Astronomer Wanda Díaz Merced – who began losing her sight in her 20s – presented one of TED’s most-watched astronomy videos. Here’s how turning a telescope’s digital data into sound can help reveal hidden patterns.